Grinding apparatus



March 13, 1945.

` R. v. HANCHETT 2,371,582

` GRINDING APPARATUS Filed March 8, 1944 3 Sheets-Sheet 1 j INVEN TOR. @25p/p mame@ BY v -March 3713, 1945. R, v- HANCHETT 2,371,582

GRINDING APPARATUS Filed March 8, 1944 s sheets-sheet 2 March 13, 1945. R, V, HANCHETT 2,371,582

GRINDING APPARATUS Filed Marsh 8, 1944 5 Sheets-Sheet .3

1/ `\\"l l Il i In IN V EN TOR.

Patented Mar. 13, 1945 UNITED "STATES,k PATENTOFFICE i Hanchett Manufacturing Coi,v Big Mich.,` a corporation of Michigan.

Application March s, 1944, serial No. 525,504

comms. tomi- 12m y This invention relates to apparatus for the surface grinding of parts, and aims to provide an apparatus which will `accurately grind with greater rapidity than apparatus heretofore employed for similar purposes.

For the type of grinding for which my present apparatus is designed,` it has been` customary to employ a grinding wheel of the cylinder or ring type presenting one or morezconcentric grinding surfaces across or relatively to which the work being ground was moved as `the wheel was revolved. In some instances the abrasive ofthe lgrindinglwheel, instead of being formed in one or more continuous rings, was made of `a group of segments carried in a chuck and spaced apart so as to afford clearance between `adjacent segments. The segmental typepermits the escape of coolant between adjacent segments and is believed to run cooler and cut more freelythan the continuous ring type. y I l f My present invention is an improvement :upon the segmental type of` grinder in that the abrasive grinding elements, corresponding in spacing to the heretofore mentioned segments, consists each `of an individually rotatable elementpf any desired shape, suchfor instance as a cylinder or ring. A plurality of these elements are mountedupon a spindlez carried `on a revoluble head, so that the elements revolve in an orbit or orbits concentric with the spindle axis while they simultaneously rotate about their respective axes. This spacing of the elements, together with their orbital revolution in conjunction with their individual rotative movements, produces a grinding action which is highly efficient and rapid, while at the same time theelements are maintained in a workably cool condition due to the air circulation around and between them.

In addition to the revoluble and individually rotatable abrasive elements above mentioned,4 my invention contemplates the employment of a sur,- rounding continuous abrasive wheel of the cylinder or ring type having its grinding face in the same plane as the grinding faces of said individual elements. This large solid wheel is designed to receive the initial pressure of the work and the individual elements will continue with the grinding in the same plane as the Work is passed across the face of the tool as a whole.

Other objects and advantages of the vinvention will be apparent as the same becomes better un derstood by reference to the following `description when considered in connection with the accompanying drawings.

Referring to the drawings,

Rapids,

Fig. `1 is a brokenside elevation of one type of apparatus embodying my invention; I n

Fig. 2 is a fragmentary longitudinal `sectional Vviewthrough the` grinding apparatus per se;

LFig. 3 is an end elevation looking toward the left at Figs. 1 and 3; and i I I Fig.4 is a` sectional view on `the line 4--4 of Fig; 2. Y

My improved grinding apparatusis capable of incorporation in grinding Vgmachinesfof various types and designs. Merelyfor the purpose ,of i1- lustrating the 4principles of myinvention,` I have here illustrated the same` as embodied in a very l simple type of machine consisting essentially of a bed or'base 5 upon which is mounted anjelectric motor 6 having an `extending shaft: or spindle 1 contained in. a supporting housing `I;` projecting from the motor and equipped with suitable bearings, such as ball bearings,` 9 .in which the spindle is journaled. l

`The grinding apparatus-'per se` of my invention is carried by andis rotatable with the spindle. As illustrated, the `endl portion II ofthe spindle is tapered to snugly fit the tapered bore I2 of a head I3 whch islocked on the spindle lby a nut I4 and lock` washer l5 and islocked against rotaticn` relatively;V to the spindle by'` `The head,` which is, circular sin form, is provided witha series of axially extending bores or openings `II, each adapted to receive a spindle housing I8 which is secured in position by a plurality of fastening bolts I9. Each spindle housing I8 carries a plurality of sets of ball bearings 2I in which is journaled a spindle 22 upon the inner end of which a pinion 23 is mounted and to which I it is rigidly locked by a key 24 and a lock nut' 25.

Upon the outer end of each of the spindles 22 there is xedly secured by suitable means an abrasive element 26 here shown as of hollow cylindrical form presenting at its outer end an an-` nular or ring-like grinding surface, although my invention contemplates the employment of a solid block of abrasive of any desired shape other edge which constitutes the grinding face of this member is disposed in a plane perpendicular to the spindle l and spindles 22 which includes the grinding faces of all of the abrasive elements 26.

For some types of work the spindles carrying the abrasive elements 26 may be permitted to rotate freely under the influence of the revolving head andthe ,Wnrk ,contactingl the.;v elements. When such @the casethe elementsmaxforlmay not rotate in lunison asthey revolve with the head.` In. some instances, however, it seems pref-f erable to positively control the rotation of the f plane perpendicular to the axis of the main spinabrasive elements and cause them toirdtatetons.

their individual axes at a common and uniform speed. kIn the form of apparatuslihereill'stratedJ provision is made for thus positivelyrotatingandf controlling the elements. This construction will nowbe described. Y

The end cap 34 of the spindle bearingghnusing.

8 is secured thereto by a series of bolts '35 and s slraped'-isfrasgtol heidisposedxlbetweenf this istationary housing-landfthe rotating'heavzfI3.' A riri'gLgeariS-i's-securedftoethenend vcan 34r2 by a pluralityioi bolts e321 Tse cthatit. iszdi'sposed-'concentrically"withitliemainnspindle'l in: position to mesh with and impart rotation-ite.the:pinions23 as ltliey;'ftt'igethenfWitlfif lth'eirirespective :spindles and attached abrasive elements are revolved `"about-"theaxisf of'fthe fspindle S51 uponurotation. of l theistaton'ary bearing Leap-.13H iininpositioni `to "sure round andguard-the4 grinding fmember 3l, yand this guardfrnayilb'e; 'adiustedz longitudinally .of "the spindle it@ :dispose vits outer :edge inf ldesired `rela- .tion-to the'pla'nesof the cuttingifaces ofi the yabras sivewelementsfby*suitable adjusting mechanism includingfaihandiwheellf f 'fnsfoperationitheimain' spindle 1 issrotateduby the motor 6 so as to rapidly revolve .theflreadL t3 canryingwith it ethelargefannulai: grindingimembcrii l' fand tl'ieplurality liftsmalliengrirrding felle*- ments: 2li-1 lThe elements -2.6, Las 'they are revolved 'arefieither individually' freely rotatableflorv are vsimultaneouslyifrotated;ieanh;vabnut its individual spindle axis byme'ason' furthe vdriving-engagement of the pinions 23 with the stationary ring;gear"36. Ther-grinding 'apparatus;thereforepresentsfin a die a large circumferential ring grinder surrounding a series of individually rotating grinding elements, all revolving concentrically with the large ring grinding member. The work to be ground is passed across the face of the abrasive elements, contacting rst the grinding face of theelargecgrinder and.then .successively the :small rotating ggrinders; '.Tlie fggind-ing action ofthe individually rotating and simultaneously r.revolving abrasive elements is very rapid and ef- "cient and the spacing of these elements permit- *tinggthe-circulation of coolant enables the apparatus asa-whole..,to operate at a lower tem- ;p'erature and muchmore efficiently than with the '.solidlgrinders orrthe segmental grinders heretolfore employed.

'Thestructural 'details illustrated and described mayl obviously be varied within considerable lim- 'its within the scope of my invention as defined in ving'il-musingsmounted'on said Thead-g' aV spindle rotatably lmounted- *in "each -fofsaid housings, said spindles being 1 disposed izsarallell withl the axis of rotationofsaid'headfaniabrasive element mountedf-upon` eachf'o'f` said spindlesga pinion mounted upon each spindle, a stationarygear ring meshing with saidl pinions,farr abrasive member mounted'rupon said ,lieadfand encirclingfsaid 'abrasive elements,.andfineans for 'revolving `said 'head to thereby effctfwsimultaneousrevolution of said -elements Aaboutie.: commonaxis fand an individual `rotation ofieachy element`` about its `respective spindlelaxis: y t

RALPH-ivi HANCHETT. 

